The older couple I have 3somes with hooked their newly divorced daughter up with me

For some time now I have been joining a older couple in their 50s for 3somes(sometimes also just for cucking, depending on the husbands shape) and it's been a lot of fun, despite the age difference (im in my early 30s) we have a lot of fun together outside the sex too. I hadn't met the daughter before, but I was no secret from her. The parents have sent pictures(non sexual) of us hanging out together to her and been open to her about my involvement and from how I precieved it she had no problems with me, even seemed positive about my existence with her parents.

Their daughters marriage was already in a bad shape when I first came into the picture, at first I didn't really know the details, but eventually I learned that it was because the husband had lost attraction towards her because she have been gaining quite a lot of weight since they started dating and the sexless marriage been bringing it to a doom. One evening when I was with them in their bed after a dp session the conversation about their daughter came up and they ended up showing me different pictures of her from before and now. She used to be very skinny, small tits and ass, but still very attractive, now she was much fatter but she has been very fortunate with how the fat been distributed, tits and hipps actually gotten massive. She's definitely at a unhealthy size but she is still very hot. Some of the pictures they showed me was from a recent beach visit where she was in a bikini and I gave the comment that I don't understand her husband when she is still that attractive despite her weight gain. I did start get a bit hard from looking at the bikini photos and I guess from that the mom got an idea, she jerked me off until I got fully hard, then recorded a short closeup video of my dick where she slowstroked it and sent it to her daughter and wrote a message after "X got like this after seeing your beach photos, he finds you really hot" in an attempt to cheer her up and hopefully boost her confidence. It was the first sexual thing of me they had sent their daughter. At the time I didn't know how she had replied to her parents, but I learned later that it was somewhere along the line of 'wow, thanks, its good to know I am still attractive to someone' and 'wish my husband still looked at me like that' and her parents basically offering to lend me to her if she ever feels in need.

Some months later they did end up divorcing and she moved back in with her parents while she was still looking for a new place, this was the first time I met her in person. As I was invited over they briefed me on that they had offered to lend me to her and said they were okay if I did end up hooking up with her. After dinner they left us alone in the living room where we at first were just chatting, as soon as the divorce came up as a topic I mentioned I thought her ex had to be blind not to find her attractive, after some exchange of compliments I decided to try push further and went over to her on the couch and kissed her and told her it's been hard to sit here for so long and resist her. Our clothes went off really quickly and we started fucking on that couch. We weren't exacly quiet and I did notice that they occasionally did peek in on us from time to time, but fucking her felt amazing and couldn't help but to cum inside of her. Over the next weeks I did switch from joining her parents and hooking up with her and eventually we started dating more seriously so she moved in with me since the parents house is a bit too small for a third person to live there for longer time. Despite us dating now she doesn't seem to have a problem that I still have 3somes with her parents rather often, even in our bed while she is still in the house. If she is actually fine with it or just tolerates it because she feels indebt and/or because I was with them first I don't know, she just says she don't mind, but I do intend to keep this up for as long as I can.